Table 1B.

Tasks and hypotheses tested during preschool years (n = 400).

Age	Tasks	Hypotheses tested
24, 30, 36, 48 Months	Preschool Language Scale-−5th Edition (PLS-5)	Does infant RDBM hand preference predict earlier development of language skills?
	Scharoun and Bryden Handedness Assessment	Does infant RDBM hand preference predict development of child hand preference assessment; Does child hand preference predict concurrent language skill?
	RDBM Handedness Assessment	Does RDBM hand preference remain stable during early childhood; Does child RDBM hand preference predict concurrent language skill; what is the relation between the two hand preference assessments?
	Theory of Mind (ToM) Tasks	Examine relation of handedness to ToM; Do infant hand preferences predict differences in ToM development; Do current hand preferences predict differences in ToM development?
60 Months	School Readiness Test-−4th Edition (SRT-4)	Do infant and child assessments of hand preference predict differences in SRT performance?
	Bender Gestalt Copy Designs Test (BGT)	Do infant and child assessments of hand preference predict differences in copy design performance?
	Scharoun and Bryden Handedness Assessment	Do child hand preferences predict hand preferences at 5 years?
	RDBM Handedness Assessment	Do infant and/or child hand preferences for RDBM predict hand preferences at 5 years?
	Theory of Mind (ToM) Tasks	Examine relation of ToM to SRT and BGT